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- colorcode/ or number ALL of the homotopic protons of the structure. Then choose which group would have the highest shift value, and which group of H would have the lowest shift values2) The molecule corresponding to the NMR spectrum shown most likely contains which of the following functional groups? 9 8 7 a. Aromatic ring b. Ether c. Aldehyde d. Alkene e. Alcohol 6 5 ppm 4 3 2 1 0A compound of formula C5H12 gives 1 signal in the 1H NMR and 2 signals in the 13C NMR. The compound is a. pentane.b. 2-methylbutane.c. 2,2-dimethylpropane.d. Cannot tell without more information.
- 4. Identify the different types of carbons and predict their approximate chemical shift. (See Figure 13-18.) CI CI CI. CI CI CIIndicate All the Functional group present for each band in the FTIR spectra.30. The following spectrum is representative which of the following types of compounds? 100 ww 40- 20- 1000 3000 2000 1500 Wavenumber tom a. carboxylic acid b. aldehyde c. nitrile d. alcohol e. halide f. Data presented does not provide enough information. 80- 60- 500
- True or False The chemical shift of an alkyne proton is higher than expected due to its location within the anisotropic cone.Acetyleugnol: Match the peaks to the appropriate number on the structure.1. Refer to the following molecules. Me. OH OH HO OH OMe 5 6 3 4 1a. For each of the following molecules, how many unique sets of protons exist? 1b. What would be the relative integration of these sets of protons? 1c. For each of the unique sets of protons, where roughly would you expect the chemical shift to be? Provide a rough range. 1d. For each of these unique sets of protons, what would you expect the splitting pattern to be? 1e. Try and use the above information and draw an NMR spectra that represents an approximation of what the spectra would look like.
- Draw the structure and estimate the chemical shifts of the hydrogens in methylene dichloride and methylene trichloride (in NMR ppm please).3. a) Draw the below structure and answer the following questions. CI CH2COCH2CH3 i. Identify the chemically equivalent protons in the structure. Explain your answer. ii. Mention how many peaks you would expect in the HNMR spectrum of the compound. Explain the position of each peak in the spectrum. iii. Mention what would be the splitting pattern of each peak with proper explanation. iv. Draw the HNMR spectrum of the compound. b) Explain why the delta/ ppm scale was introduced instead of Hz in NMR analysis with example.In a 300 - MHz spectrometer, the protons in iodomethane absorb at a position 650 Hz downfield from TMS a. What is the chemical shift of these protons ? b. What is the chemical shift of the iodomethane protons in a 60- MHz spectrometer? c. How many Hertz downfield from TMS would they absorb at 60 MHz?